2
ANDERSON GREENWOOD
SERIES 81 SPRING OPERATED PRESSURE RELIEF VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
FIGURE 2
Series 81 (F, G, H and J Orifices)
3 VALVE REPAIR (F, G, H AND J ORIFICE)
Refer to Figure 2
3.1 Disassembly
3.1.1
Relieve spring tension and back
blowdown screw out two turns.
3.1.2
Remove spring bonnet and valve internals.
Note:
a pipe nipple can be attached to vent
holes in top of guide to facilitate removal.
(⅛”-NPT: F, G or ¼”-NPT: H, J)
3.1.3
Separate nozzle from guide by hitting top
of spindle on soft surface.
3.2 Repair
3.2.1
Hold spindle by skirt O.D. in soft jaw vise
and replace seat.
3.2.2
Examine nozzle and polish seating
surface as required. Replace if necessary.
3.3 Assembly
Assemble in reverse order of disassembly.
Do not lubricate spindle or guide. Make sure
the guide plugs, if used, are flush or below
the top guide surface. Refer to table for plug
requirements. Make sure nozzle is fully and
evenly seated in guide. This is a press fit joint.
Lubricate threads and pressure adjustment
screw tip.
Orifice
Set pressure (psig)
Quantity
F
Above 354
2
G
Above 223
2
H
Above 227
3
J
Above 142
3
Pressure adjustment
screw
Pressure seal
Spring washer
Spindle
Spindle
Drive pin
Blowdown
adjustment
screw
Guide
Guide
Seat
Bonnet seal
Bonnet
Seat
Blowdown seal
Nozzle seal
Nozzle
Nozzle
Body
Retainer screw
FIGURE 1
Series 81 (-4, -6, -8 Orifices)
• Parts contained in kit
Pressure
adjustment screw
Spring washer
Spindle
Spindle
Drive pin
Blowdown
adjustment
screw
Guide
Guide
• Seat
• Seat
• Blowdown seal
• Bushing seal
Nozzle
Nozzle
Body
Bushing
Retainer
screw
Orifice
TFE/KEL-F
Set pressure range
Vespel
Set pressure range
psig
kpag
psig
kpag
-4
04.4805.001
20-4000
138-27579
04.4805.002
4001 and up
27586 and up
-6
04.4805.003
20-1500
138-10342
04.4805.004
1501 and up
10349 and up
-8
04.4805.005
20-1500
138-10342
04.4805.006
1501 and up
10349 and up
